With MCU Only = 0, the backup boot mode is selected via pins within the main BOOTMODE map. Table 4-9 lists all possible backup boot modes when MCU Only = 0. For backup boot modes when MCU Only = 1, please refer to Table 4-6.
Table 4-9 Backup Mode Selection When MCU Only (MCU 6) = 0Backup Boot Mode Pins | Backup Boot Mode Selected |
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3 | 2 | 1 |
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0 | 0 | 0 | None (no backup boot will be attempted) |
0 | 0 | 1 | USB – Device (DFU) |
0 | 1 | 0 | Reserved
|
0 | 1 | 1 | UART |
1 | 0 | 0 | Ethernet |
1 | 0 | 1 | MMC/SD card |
1 | 1 | 0 | SPI |
1 | 1 | 1 | I2C |